1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_AURA_WINDOW_OBSERVER_H_
#define UI_AURA_WINDOW_OBSERVER_H_
#include "base/basictypes.h"
#include "ui/aura/aura_export.h"
namespace gfx {
class Rect;
} // namespace gfx
namespace aura {
class Window;
class AURA_EXPORT WindowObserver {
public:
struct HierarchyChangeParams {
enum HierarchyChangePhase {
HIERARCHY_CHANGING,
HIERARCHY_CHANGED
};
Window* target; // The window that was added or removed.
Window* new_parent;
Window* old_parent;
HierarchyChangePhase phase;
Window* receiver; // The window receiving the notification.
};
// Called when a window is added or removed. Notifications are sent to the
// following hierarchies in this order:
// 1. |target|.
// 2. |target|'s child hierarchy.
// 3. |target|'s parent hierarchy in its |old_parent|
// (only for Changing notifications).
// 3. |target|'s parent hierarchy in its |new_parent|.
// (only for Changed notifications).
// This sequence is performed via the Changing and Changed notifications below
// before and after the change is committed.
virtual void OnWindowHierarchyChanging(const HierarchyChangeParams& params) {}
virtual void OnWindowHierarchyChanged(const HierarchyChangeParams& params) {}
// Invoked when |new_window| has been added as a child of this window.
virtual void OnWindowAdded(Window* new_window) {}
// Invoked prior to removing |window| as a child of this window.
virtual void OnWillRemoveWindow(Window* window) {}
// Invoked when this window's parent window changes. |parent| may be NULL.
virtual void OnWindowParentChanged(Window* window, Window* parent) {}
// Invoked when SetProperty(), ClearProperty(), or
// NativeWidgetAura::SetNativeWindowProperty() is called on the window.
// |key| is either a WindowProperty<T>* (SetProperty, ClearProperty)
// or a const char* (SetNativeWindowProperty). Either way, it can simply be
// compared for equality with the property constant. |old| is the old property
// value, which must be cast to the appropriate type before use.
virtual void OnWindowPropertyChanged(Window* window,
const void* key,
intptr_t old) {}
// Invoked when SetVisible() is invoked on a window. |visible| is the
// value supplied to SetVisible(). If |visible| is true, window->IsVisible()
// may still return false. See description in Window::IsVisible() for details.
virtual void OnWindowVisibilityChanging(Window* window, bool visible) {}
virtual void OnWindowVisibilityChanged(Window* window, bool visible) {}
// Invoked when SetBounds() is invoked on |window|. |old_bounds| and
// |new_bounds| are in parent coordinates.
virtual void OnWindowBoundsChanged(Window* window,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) {}
// Invoked when |window|'s position among its siblings in the stacking order
// has changed.
virtual void OnWindowStackingChanged(Window* window) {}
// Invoked when a region of |window| is scheduled to be redrawn.
virtual void OnWindowPaintScheduled(Window* window,
const gfx::Rect& region) {}
// Invoked when the Window is being destroyed (i.e. from the start of its
// destructor). This is called before the window is removed from its parent.
virtual void OnWindowDestroying(Window* window) {}
// Invoked when the Window has been destroyed (i.e. at the end of
// its destructor). This is called after the window is removed from
// its parent. Window automatically removes its WindowObservers
// before calling this method, so the following code is no op.
//
// void MyWindowObserver::OnWindowDestroyed(aura::Window* window) {
// window->RemoveObserver(this);
// }
virtual void OnWindowDestroyed(Window* window) {}
// Called when a Window has been added to a RootWindow.
virtual void OnWindowAddedToRootWindow(Window* window) {}
// Called when a Window is about to be removed from a RootWindow.
virtual void OnWindowRemovingFromRootWindow(Window* window) {}
protected:
virtual ~WindowObserver() {}
};
} // namespace aura
#endif // UI_AURA_WINDOW_OBSERVER_H_
|
